A Perspex organ bath with fine thermostatic temperature control. Electric stirrer; and complete set of accessories, making it a versatile unit for all research work, bath 12'x 9'x 8', with leak proof dovetailed joints, resting in sturdy metal frame; top of the bath carries a 1'x 3/8' thick band, for fixing accessories. Inside the bath is a metal sheathed heating element (easily replacements) controlled by means of a fine adjustable thermostat with sensitivity +1oC.